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Electrochemical cell stack

A battery stack and electrochemical technology, applied in electrochemical generators, fuel cells, solid electrolyte fuel cells, etc., can solve problems such as inapplicable spring systems

Inactive Publication Date: 2008-08-27
HYDROGEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] For high voltage systems where the battery stack is inserted into a pressurized enclosure, conventional spring systems are not suitable as the springs are usually made of materials that would cause poisoning of the environment inside the enclosure

Method used

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Embodiment Construction

[0049] Figure 1 illustrates the water electrolysis process in a PEM cell, where water is supplied to the anode side 1 and, under an applied electric potential field, becomes split into oxygen, protons and electrons. The proton migrates to the cathode side 3 where it recombines with an electron to form hydrogen gas.

[0050] Figures 2a and 2b show two typical concepts where a) the flow pattern is integrated into the bipolar plate or b) the porous layer is inserted between the bipolar plate and the electrode backing. This porous layer must then provide electrical contact between the bipolar plate and the electrode backing, and it must provide fluid flow into and out of the battery compartment. A gasket is placed around the electrode backing area between the membrane and the bipolar plate (not shown in Figure 2). Fluid flow to and from the cell is typically through gaskets and channel arrangements within the bipolar plates.

[0051] FIG. 3 shows a battery stack 4 of 10 cells co...

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Abstract

The present invention relates to a cell stack having at least one electrochemical cell arranged between a first end plate connected to an electrical bolt and a second end plate connected to another electrical bolt, said stack having a housing, means for providing fixed support of said stack to said housing and means for maintaining a constant load over said cell stack. Said means for maintaining a constant load comprise an elastic pad inserted into the space between said cell stack and said housing wall. The cell stack is applicable in the area of PEM fuel cells and PEM water electrolyser cells.

Description

technical field [0001] The invention relates to an electrochemical cell stack with means for maintaining a constant mechanical load on the components of the cell stack. Background technique [0002] Electrochemical cells using polymer membranes as electrolytes, such as proton exchange membranes (PEM), are attracting increasing attention in the field of PEM fuel cells and PEM water electrolyte cells in which protons constitute ionic charge carriers. [0003] Each cell comprises an assembly of a membrane and two catalyst layers on each side, a membrane electrode assembly (MEA), where the catalyst layers constitute the electrodes and are in intimate contact with the membrane. The MEA is furthermore supported by an electrode backing on each side, typically a porous plate, mesh or porous sheet with good electrical conductivity and high electrochemical / chemical stability. The electrode backing has a certain integrity to match the electrode layers and operating regime. The water ...

Claims

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Application Information

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IPC IPC(8): H01M8/24H01M8/02C25BH01M8/10
CPCH01M8/248Y02E60/50H01M8/2475H01M2008/1095H01M8/247
Inventor 埃吉尔·拉斯腾奥德蒙·维勒维克
Owner HYDROGEN TECH
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